Oxygen diffusion in superconducting YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ oxides in ambient helium and oxygen

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.772· OSTI ID:7004852

Tu, K N; Tsuei, C C; Park, S I; Levi, A

In situ resistivity measurement has been used to monitor diffusion of oxygen in and out of bulk and polycrystalline YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ in ambient O/sub 2/ and He atmospheres. The out-diffusion of oxygen from the oxide is found to be independent of delta and its rate is surface-reaction limited with an activation energy of 1.7 eV. The in-diffusion depends strongly on delta; the activation energies of the process at deltaapprox. =0 and delta = 0.38 are 1.1 and 0.48 eV, respectively. The latter is taken to be the activation energy of motion and the former, the activation energy of diffusion. On the basis of the kinetic and published structural information, we have proposed a defect mechanism in the CuO plane for the anisotropic diffusion of oxygen in the oxide.

• Research Organization: IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 7004852
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
RADIATION TRANSPORT
TRANSITION ELEMENT COMPOUNDS
TWINNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES